"Good resolution, I was overcomplicating this exercise. I'm really not good at this, honestly."

Thanks,learn a lot!

Amazing Bro

Thanks, this was helpful eventhough I'm a year late.

Great solution, I think is one of the efficent. Great:)

Not a best practice, for sure.

What do you mean by this? Can you explain how it uses more memory?

Hey why does this work without including string.h? When I tried using strlen I got a "no implicit function declaration" error...

You are correct; this prompts a warning: format specifies type 'int' but the argument has type 'size_t'.

Since count is of type size_t, I think the format specifier should be %zu instead of %d.

Well, that's what I did. Why should I think (or how should I realize) that it's bad? ... P.S. it occurs to me after a few minutes that I'm testing and choosing every time qsort_r calls cmp and not just the one time. If that's the only reason, I guess it's bad enough.

in the ASCII table you will find '\0' is equal to the demical '0'.
*buffer = 0; is equivalent to *buffer = '\0'

Or, maybe I wrote it this way for fun, not ever intending it to be production code...